Sr. Fullstack Engineer, Identity Platform

AI at Zapier

At Zapier we build and use automation every day to make work more efficient creative and human. So if youre using AI tools while applying here - thats great! We just ask that you use them responsibly and transparently.

Check out our guidance on How to Collaborate with AI During Zapiers Hiring Process including how to use AI tools like ChatGPT Claude Gemini or others during our hiring process - and when not to.

Job Posted: March 17 2026

Updated: April 29 2026

Location: Americas - North Central and South America

Zapier is building the foundational systems that enable users and services to securely interact across our platform. As a Senior Fullstack Engineer on the Identity Platform team youll design and scale the systems that define and enforce access across Zapier from permissions and policies to OAuth/JWT infrastructure and service-to-service authentication.

This is a high-impact platform role: youll shape how access is modeled enforced and scaled across Zapier establishing consistent patterns that power secure interactions across a large distributed system. The systems you build will be used by many teams and services forming the foundation for how authentication and authorization work across the company.

Your work will directly support Zapiers core product strategy and influence how access is enforced at scale enabling secure automation enterprise-grade governance and the next generation of capabilities across the platform.

About you

• Youre an experienced fullstack or platform engineer who has built real-world authentication and authorization systems at scale. Youve helped define or evolve IAM platformsnot just used themthrough collaboration across engineering product and other stakeholders. You bring experience with OAuth JWTs token-based authentication and service-to-service auth and are comfortable working with modern permission models such as RBAC ABAC or relationship-based access control.

• You think in platforms not features. Youve built shared systems other teams depend on and understand how to design stable APIs manage breaking changes and maintain strong boundaries as systems scale. You have solid systems instincts and consistently consider security scalability and correctness in your designs.

• Youre comfortable working across the stack. This is a fullstack role on a platform teamyoull primarily build backend systems but also contribute to developer-facing UIs and tooling when needed. You dont need to be an expert in every layer but youre not blocked by any of them.

• You move quickly and work well in ambiguity. You believe building enterprise-grade systems can be both fast and secure and you use that mindset to ship working solutions early using prototypes to drive alignment rather than waiting for perfect specs. Youre comfortable iterating discarding work when needed and treating it as part of the learning loop.

• You use AI agents as a core part of your workflow leveraging them to explore codebases accelerate development and prototype solutions quickly. You understand their limitations continuously refine your approach and help others on your team work more effectively with them.

• You operate with strong ownership and communication. You take initiative work transparently in an async environment and keep stakeholders informed without being asked. Youre comfortable engaging directly with both internal engineering teams and enterprise customers and you use written artifacts prototypes and demos to influence and drive clarity and alignment.

Things youll do

• Be a thought leader in the Identity domain helping to set the vision for our platforms to enable Zapiers engineering teams to move fast and securely

• Partner with Product and Engineering leadership to define and implement Zapiers Governance strategy. Evolve Zapiers IAM platform to provide consistent reliable controls for our largest Enterprise customers

• Design and evolve authorization systems that power permissions roles policies and access control across Zapiers ecosystem

• Build and scale OAuth and token infrastructure including access tokens refresh tokens and scopes. Lead cross-team efforts to unify and simplify auth patterns across Zapier

• Develop and maintain JWT infrastructure (signing validation key rotation) used across APIs and services

• Define and implement service-to-service authentication patterns (client credentials service identity token propagation)

• Improve and enforce authorization consistency across services through SDKs middleware and shared platform patterns

• Partner with product and infrastructure teams to standardize access control models across the product

• Drive platform-level decisions around security performance and scalability of access management systems

Level

This is a Senior Engineer role. Senior engineers at Zapier own outcomes end-to-end within their team and extend impact beyond it. Youll coordinate across ownership boundaries shape technical direction for adjacent systems and bring other engineers along with you.

Our level definitions may look different from what youve seen elsewhere. Well be transparent about leveling before you reach the final stages.

Application Deadline:

The anticipated application window is 30 days from the date job is posted unless the number of applicants requires it to close sooner or later or if the position is filled.

Even though were an all-remote company we still need to be thoughtful about where we have Zapiens working. Check out this resource for a list of countries where we currently cannot have Zapiens permanently working.

Required Experience:

Senior IC